Centipedes are sometimes referred to as hundred-leggers, but they can have from 15-177 pairs of legs. They are mostly nocturnal and prey on flies, plant tissue and spiders. Centipedes can invade homes and when they do, they are often found in damp areas such as damp basements, crawlspaces, and bathrooms. They do not pose a a serious healt threat. They are considered a nuisance pest. Some larger species can inflict a painful bite to humans and can cause swelling.